Tooled horn

A tooled horn is a tonal musical instrument, and the only non-magical horn. It can be used to play the passtune to enter the castle. Improvising with it will awaken (and possibly scare) nearby monsters – including pets – and will abuse your wisdom.[1] Monsters are awakened if their distance to you is at most 5.48 times the root of your level, and are scared (if not resisted) if their distance to you is at most 3.16 times the root of your level. They have the usual resistance roll against the scare effect. But even fleeing monsters are reluctant to retrace their steps.[2] In a corridor, they will often get stuck between you and the place they came from -- and continue attacking you.[3]

BUC status has no effect.

The tooled horn is a valuable item for pacifist players, as it can cause monsters that have engulfed you to spit you out. It will also scare monsters that do not respect Elbereth and unfreeze pets that have attacked a floating eye.